عنصر أنبوبي صلب يناسب بين المحمل وغطاءه، تم تصميمه في المقام الأول كسطح تآكل قابل للاستبدال داخل الجدار الداخلي للغطاء.
"76301-ps-21201 specification (includes engineering type bulletins, brochures,etc., that reflect specification type data in specification format; excludes commercial catalogs, industry directories, and similar trade publications, reflecting general type data on certain environmental and performance requirements and test conditions that are shown as "typical", "average", "nominal", etc.)." test data document, steel,mil-s-5000,o/a; black oxide,ams 2485,surf treatment,o/a; 1.600 in. min and 1.620 in. max id at internal flange; 0.045 in. min and 0.065 in. max internal flange w; 1.8504 in. min and 1.8508 in. max id; 2.0000 in. min and 2.0005 in. max body od; 0.439 in. min and0.484 in. max o/a w; external flange at end opposite of internal flange,0.045 in. min and 0.065 in. max w; 2.34 in. min and 2.36 in. max external flange od general characteristics item description